Water-cooled tuyere



R. H. LEDBETTER WATER cooLED TUYRE Aug. 26, 1930.

Filed Oct. 14, 1927 Patented' Aug. v26, 1930 BOY H. LEDBETQER; OIE' FIRFIELRALABAMA Application led October 14, 1 927. Serial Nfo. 226,136.

Thisinvention relates to improvements in tuyres of the ch'aracterusedi in producing the air blast for blast furnaces. Tuyres have been raadde heretofore with extension walls for supporting a cementitious material intended to prolong the life ofv the tuyre.z

Experience has shown that quick cutting a'ction of the blast combined with the abrasive action of descending coke and iluxin'g by contact with the molten slag soon removes the material and exposes ythe metallic art of the tuyre to the destructive action ofp the slag,coke, ore, etc. in the furnace. VMy improved tuyre aims to overcome such disadvantages. In ltuyres heretofore used, the' aim has been to provide a materialcapable of withstanding extreme heat and the choice has usually been limited to a refractory material because of its capability of 'withstanding high temperatures. ,My improved tuyre includes a precasthard burned, dense,

{ire-brick tile which is keyed or interlocked with thewater wall'of the tuyre. The material which 'I prefer to use is chosen not be# cause of its refractory qualities but because of its ability to resist both 'the action of slag Y in the :furnacev and vthe abrasive action of coke and other materials charged to the. furnace. f Y

An,l embodiment of theinvention is i1-` lustrated in the accompanying drawings 1n which- Y 'Fi 1 is a longitudinal section through '3"5- lthe b ast furnace tuyre;

ner end of the tuyre,v thus being a kslight Y modification;

Fig. 2 is a fragmentary section of thein- Fig.l 3 is a sectional viewfillustrating a further. modification.

-Refte'r1-1ng'in detailto the'drawings the. tuyre includes outer and inner substantiall I concentric walls 1'0 and 12 spaced apart s'u l iciently to form achamber 14 for the circulation ,of cooling water which is supplied by l.' t-hwnwhiche'naethe gdpgilos qand 18 fol-m515 m Vthe -rmg 26 which as above mentloned 1s formed i of material adapted to. resist abrasion and outer wall 20 oft e tu re Near the front en ofthe tuyre shown in;Fig. 1, I vprovide a wall 22 of substantially V-shape "in, cross-Section. This wall 1s formed with outwardly extending projections 24 which interlock with suitable openings in a precast tile member 26. The front Vof the tuyre is curved over as shown so .as

to form a front or inner Wall 28 which covers the front face ofthe tile 26. At a plurality of points, I provide cored holes '30, usually four in number.

. l f vThe tile member 26 is precast and burned and is secured to or bonded in place i-n the tuyre during the casting thereof. In other words, the lire-bricky ring 26 forms `sort o f a core about which the metal of the tuyre is poured. It is highly desirable to form the protective tile member 26 of a'material capable of resisting the abrasive action of coke and other materials to be charged to the blast furnace. The material used should also be adaptedto resist the action of furnace slag.

Suitable materials for the formation of the tile 26 are aluminum oxide such as fused in the electric furnace and dense silicon carbide. These' materials are more desirable than ordinary ire-brick as they offer greater resist- .ance to abrasion and their glazed surfaces will retard slag penetration and, therefore,v minimize the iluxing action of the molten contents ofthe furnace.. Any of these materials canbe precast into rings andformed with suitable recesses to cooperate with the diverging lugs '24 as shownvin Fig. -1. Or

`the cross-sectional shape of the ring may be made like that shownat 26 in Fig. 2 formed with recesses for coaction with the inclined lugs 24a. Similarly,vthe protective tile may be of the cross-sectional` shape indicated at 2 6b in Fig.` 3 so as to provide an annular7 dovetailed groove' 32 for coaction with the dove-tailed extension 34 cast in the wall 22ab of thetuyre. k .I

Whenthe tlgiyre is put in service, the front metallic Wall 28 will gradually 4be either eroded'or'burned away but the remaining part of the tuyrewill be protected by7 the tile fluxing action of the bath and slag. The'l tile as described is intimately bonded to or interlocked with the metal body ef the tuyard so that a'wiu not be readily dislodged even after the front Wall 28 burns away.

Various modifications may be-made without departing from the invention as defined' in the appended claims..

What I claim is l 1. A furnace tuyre comprising Ya water jacketed 'body portion having a precast tiley incorporated and enclosed in an end portion thereof, said tile having a glazed outer skin 4- adapted to retard slag penetration and to resist abrasion.

2:. A blast furnace tuyre comprising a water jacketed body` portion, the end of which enclosesv` a tile having aT glazed skin of greater density than the inner portion of the tile body.

3. A blasts furnace tuyre comprising substantially or approximately cylindrical shells joinedby transversely spaced walls, one of said walls having a precast tile member incorporated therein, said tile having a glazed outer surface adaptedto retard slag penetration and resist the iuxing action ofmolten blast furnace burden materials.

In Witness whereof, I have hereunto signed my name.

` ROY H. LEDBETTER. 

